Source Adjustment

Source Adjustment is a SERVICE Routine which should be performed when a component in the source chain is replaced, or when the VNA fails an annual calibration. It adjusts the VNA source power for flatness across its full frequency range.

This topic does NOT discuss Source Power Calibration, which calibrates a VNA source over the current measurement range.

NOTE: The is available for M937xA and P937xA only. An adjustment software is provided as an external software for the other products

Required Equipment

Note: The power sensor depends on the VNA frequency range. Depending on the VNA model, two power sensors may be required to test the full frequency range. The VNA front panel connector type will determine the cable used and if an adapter is required with the power sensor(s).

See list of supported power meters and sensors.

See VNA Accessories

Procedure

Note: You must be logged onto the VNA as an Administrator to perform an adjustment. Learn more.

1. Refer to your power meter documentation to ensure the proper calibration factors for the power sensor have been entered into the table on the power meter.

2. Connect a GPIB cable between the power meter and network analyzer (use the System Controller GPIB port if applicable.)

3. Ensure the power sensor(s) are connected to the power meter.

4. Click Utility, then System, then Service, then Adjustment Routines...

5. At the Adjustments selection, click Source Adjustment.

6. There are 3 different version of the Source Calibration software; all are slightly different. All have a button that is labeled "Calibrate" or "Adjust". This is the button that will begin the calibration process. Some versions will also have a button labeled "Verify" that will test the source calibration without making any changes. Other selections are for factory personnel use only.

7. Once begun, you must enter the power meter and sensor information. The software will verify the power meter and sensor. You are then prompted to connect the sensor(s) and cable as needed.

Connecting  sensors to the VNA

Additional Information

All ports are tested on all VNAs. Source calibration takes approximately 10 to 45 minutes to complete depending on the frequency range and model number of the VNA.

Troubleshooting

In the event there is a problem with Source Adjustment, please refer to the "Troubleshooting" chapter in the VNA Service Guide.

Data Storage

• The correction data is stored in the flash memory on the Test Set Mother Board.

Last Modified: